Calculate panel efficiency changes with temperature

Calculate panel efficiency changes with temperature

Panel Efficiency Variation With Temperature

  • Did you know that even the most efficient solar panels will be affected by rise in temperature
  • The temperatures developed within panels will be much higher than the outside temperatures, resulting in decrease from stipulated efficiencies
  • Input your panel efficiency and the temperature in your region
  • Based on it, we will calculate the actual efficiency that will be reached by your panels

Panel Efficiency Variation With Temperature

Panel efficiency provided by manufacturer (This will be at 25 oC Standard Test Conditions – STC)


Usual Temperature In Your Area


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echo $message;
if((isset($_POST[‘panel_efficiency’]))&&(isset($_POST[‘temperature’]))) {

if((!empty($_POST[‘panel_efficiency’]))&&($_POST[‘temperature’])) {
$servername = ‘localhost’;
$username = ‘solarman_cal’;
$password = ‘mv)f848R4h~&’;
$dbname = ‘solarman_tools’;
// Create connection

$conn = mysql_connect($servername, $username, $password) or die(“Unable to connect to MySQL”);
mysql_select_db($dbname, $conn );

$I1 = $_POST[“panel_efficiency”];
$I2 = $_POST[“temperature”];
$I3 = $I2 + 20;
$date= date(‘Y-m-d’);

$sql = “INSERT INTO `efficiency_temp` (`panel_efficiency`, `temperature`, `date`, `ip`) VALUES (‘$I1′,’$I2′,’$date’, ‘$ip’)”;
if (mysql_query($sql) === TRUE) {

} else {
echo “Error: ” .mysql_error() . “

echo “

Calculated panel efficiency


Panel efficiency at STC (25 oC):

$I1 %

Usual temperature in your region :

$I2 oC


Panel efficiency at given temperature ($I2 oC): $answer %

  • Calculation assumes a temperature coefficient of -0.45%/oC. Please check the manufacturer’s datasheet for actual thermal coefficient.
  • Panel temperature developed will be usually 20 oC above ambient temperature.



echo “

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